I just tried logging in on your site. When I clicked the Facebook login button, the following message appeared:
This app is in sandbox mode. Edit the app configuration at developers.facebook.com/apps to make the app publicly visible.
Please go into the Facebook Developers area and check your App Settings so that Sandbox Mode is "Disabled". That's the only setting that we can't set with Autotune, and boy do we wish we could.
I hope that helps get you going, but if not, let me know.
Thanks,
Alex